Valve



May 25 1926.

' w. G. WILSON VALVE Filed Jan. 4, 1923 2 Sheets-Sheet, 1

INIENZ'OR. lf y/le 5. 114/507 W M ATTORNEYS.

May 25 1926."

1,586,347 w. G. WILSON VALVE Filed Jail. 4, 1923 v 2 Sheets-Sheet L2 W mpg/7v TOR. BY :22.

M M ATTORNEYS.

l atented May 25 1926..

UNITED STATES WYLIE o. WILSON, E JEEsEY CITY, NEW JERsEY, ASSIGNOR r'o LOOSE s A'r vALvE c MrANY, A CORPORATION or DELAWARE.

VALVE.

Application filed January 4, 1923. Serial No. 610,580.

This invention relates to an improvement in valves and has particular reference to means for operating the sealing element of a valve in cooperation with 1ts seat. Heretofore it has been the practice to operatesaid sealing member through the medium of a valve stem, which in turn was operated oscareless or unskilled operators, the stem 1 operating meansmay cause'the sea1ing ele ment to bear on its seat with a degree of pressure which may be-detrimental to both the sealing element and its seat. =.The purpose of this invention is to providemeans for obviating said obj ectionablefeatures.

'' Thisimprovement is accomplished by a construction. wherein-the valve stem is vided into two sections and an elastic element is interposed between said sections.

The valve operating means, operating directly on one of said sections and'through the medium of cooperating detents or stops carried by said sectionsof the stem, operating to lift the sealing element from its seat, and through the medium of said elastic element operating to restore said sealing. element to its seat and to cause said sealing element to bear on its seat with an elastic pressure. Said valve operating means being so restricted in'its movement as to cause compression of the elastic element within predetermined limitations, thus limiting the degree to which the elastic element can be compressed, and hence the degree of pressure on the valve elements; 1 f

The importance of such limitation of possible pressure exertedon the valve elements, is particularly manifest Where a fragile material, such as glass, is employed in the construction of such valve elements, but it is also apparent when soft metals are employed in such construction, indeed it is beneficial under all circumstances andconditions.

The invention is illustrated in the accompanying drawings, wherein the parts are in dicated by numerals, like numerals havin reference tolikeparts.

Figure 1 isa vertical section partly in elevat1onshowing the valve closed.

Figure 2 is a. vertical section of part of Figure 1, taken in a plane at right angles to the plane in which Figure 1 is taken.

Figure is a vertical section in the same plane as Figure 1, showing-the valve open.

1 1s a casing and 2 a headfor the same.

3 is a valve seat and 4a sealing element adapted to cooperate with said seat; The

sealing element is preferably formed with a head 5 having two flanges, as 6-6. The valve stem is divided into two sections. 7 is one section. One vend of said section 7, is provided with .a bifurcated member .as,8,

with inturned fianges'as 99, said bifurcated element being adapted to embrace the flanges 66 of the headf5 when said head is .intro duced within the arms thereof in a line at right angles to the, axisof'the stem section. The other end of the stem section7 is provided with an annular indentation or, recess as 10, and '11 is split ring or detent adapted to be sprung into said recess 10,'t o-serve as'a meansfor operating said section 7 ofthe stem when engaged by a detent later to be described.

The section 7 of the stem is mounted to re- OIRIOCfliJGWlfihlIl-fili aperture 12 of the valve casing head 2 where it is sustained and sealed by the usual gasket as 13, in cooperation with the gland 14., p r V A screw threaded aperture as 15 is pro- T NT OFFICE. p

vided in the head 2 of the casing. -16 is an externally screw threaded cylindrical element adapted to be screwed into theaperture- 15 by means of the hand Wheel 17 The ele ment 16 is the other section of the valve stem, said sections 7 and 16 being mounted inaxial alignment. The thrust ofusuch screw threaded member 16, being'limited by the contact faces 18 of the casing and 19 of the cylindrical member 16.: .20 is a hollow cap having a screw thread connection with" said cylindrical member 16 at 21. 29. is an elastic element as arhelical spring mounted within the hollow cap 20 and preferably seated at one end in a bearing cup'23 which rests on the end of the stem section 7 24- 24: are detents formed onthe interior 0f the cylindrical member 16 adapted to engage the collar 11, as stated. 25 is an annular memher or skirt dependent from the casing head 2 within which the sealing element l is mounted to reciprocate. Said dependent member 25 serves as a guide for the sealing element, and also as means for preventing the displacement of the locking engagement between the sealing element andthe bifurcated end of the section 7 of the stem, when these are united and drawn within its embrace.

The operation of the device is as follows: when the hand wheel 17 is turned to open the valve, the cylindrical member is thereby rotated and the cooperating threads cause said member 16 to move out of its aperture, thus bringing the detcnts .24 into engagement with the collar 11., thus operating to lift the sealing element off its seat. A reverse movement of the hand'wheel 17 will cause the cap 20 to bear on the spring 22 and the spring 22 to hear on the end of the section 7 of the stem, thus seating the sealing element 4, but without compression. A further movement of the hand wheel will operate to compress the spring '22,until the faces 18 and 19 are in engagement at which time the spring will be partly compressed, all within predetermined limitations of movement and degrees of compression as the circumstance of the case may require.

Hence it will be impossible for a careless or inexperienced operator to cause the valve operating mechanism to bear on the sealing element andth'e valve seat with a pressure greater than that prescribed by the law of its structure, i. ef beyond predetermined limitations.

It will be noted therefore, that the mechanism comprises a. valve stem divided into two parts, one of which is 7 and the other 16, and its accompanying parts,and that an elastic element as '22 is interposed between them-,and all of these elements are mounted in axial alignment.

In the operation of this mechanism the mechanically produced crushing stress on the valve elements is definitely predetermined, and is in the form of an elastic pressure. Should the valve elements or the casing of the valve expand or contract due to temperature changes, still'the mechanically produced crushing stress is in the form of 7 a yieldable elastic pressure, and therefore the valve elements are freed from the destructive crushing stresses which today occur in rigidly screwed down valves when a hot fluid is suddenly passed through the valve, expanding the more completely immersed valve elements before the casing eX- pands; or when an external chilling contracts the casing before the contained valve elements contract; or crushing stress due to the fact that the valve elements are constructed (as they frequently are) of metal which has a greater coefficient of expansion than does the material of which the casing is constructed, both valve elements and casin being equally heated after the valve is screwed down on its seat.

lVhat I claim is:

1. In a valve, a valve seat and a sealing element adapted t cooperate therewith, a valve stem suitably mounted to reciprocate within the valve casing and within a cylindrical element mounted in the casing in axial alignment with said stem, said stem carrying at one end said sealing element and provided at the other end with a suit able detent to cooperate with a detent on the inner periphery of said cylindrical element, a hollow cap mounted on said cylindrical element with a spring interposed be tween the interior of said cap and the end of said stem, said cylindrical member being externally screw-threaded to mesh with corresponding screw threads formed in an aperture of the casing, means to rotate said cylindrical element to lift the sealing element from its seat by engagement of said detents, and to restore the same to its seat by reverse movement of said cylindrical element, the parts being adjusted so that after the sealing element is seated .a further rotation "of the cylindrical. element will cause a compression of the spring and hence producean elastic pressure on the sealing element to hold the same in a seated position, with means to limit the movement of said cylindrical element for "the purpose of limiting the degree of pressure brought to bear upon said elastic element and hence upon said sealing element.

2. In a valve a valve seat, a sealing element adapted to cooperate therewith, said sealing element having a head with transverse protuberances, a valve stem suitably mounted to reciprocate within the valve casing and provided at one end. with a bifurcated element adapted to cooperate with the head of said sealing element, said head being adapted to slide transversely bet-ween the arms of said bifurcated member, the opposite end of said stem being provided with an annular recess and a ring member of greater diameter than the stem, adapted to be freely mounted within said annular recess, operating means for said sealing relemen-t comprising a cylindrical member provided internally with a peripheral detent adapted to engage said ring, a cap for said cylindrical member, with a spring interposed between the interior of said cap and the end of said stem, said cylindrical member being externally screw-threaded to mesh with corresponding screw threads in an aperture of the casing, said cylindrical member and stem being coaxially mounted, and means to rotate said cylindrical member, and means to limit the extent of its tion to compress said spring within prede-f termined limitations, thus causing the sealing element to bear upon its seat within predetermined limitations of pressure corresponding to the degree of pressure on the spring.

3. In a valve, a valve stem divided into two sections, one of which -is cylindrical in form and externallyscrew threaded to mesh with a corresponding screw threaded aper ture in the valve casing, with means external of the casing to rotate the same, and means to limit such rotation and the thrust thereof by a positive engagement between said section and said casing, a cap for the cylindrical section and an elastic element mounted therein, and a detent within said cylindrical section, the other section of said stem provided at one end with a shoulder adapted to cooperate with said detent within the cylindrical section and carrying at the other end a valve sealing element adapted to cooperate with a suitable valve seat,.

said sections of said stem and the elastic element being mounted to operate coaxially, with said elastic element interposed between said sections, the relation of the elements being such that when the cylindrical section of the stem is rotated in one direction the sealing element will be liftedfrom its seat through engagement of said detent within said cylindrical section with said shoulder and when rotated, in the reverse direction the sealingelement will, through the me- ;dium ofsaid elastic element, be seated and pressed to its seat by the compression of said elastic element within the limitations of the thrust of said cylindrical section as prescribed by the positive engagement between said cylindrical section and said casing. i

Signedby me at Jersey City this 2nd day of January. 1923.

,WYLIE e. WILSON, 

